Has Plots changed something about vline(!)? Today in the newly installed machine I tried:
begin
pyplot()
Plots.plot([57,89])
Plots.vline!([1.25])
end
and got the error quoted at the bottom. The new Plots is v"1.20.0" while on the v"1.19.3" machine it worked fine.
MethodError: no method matching Val{:vline}